/**
 * 全局黑白样式
 */
html, html * {
  filter: gray !important;
  filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
  filter: grayscale(100%);
  -webkit-filter: grayscale(100%);
  -moz-filter: grayscale(100%);
  -ms-filter: grayscale(100%);
  -o-filter: grayscale(100%);
}
